4.7 Article Proceedings Paper

Interzeolite transformation from FAU to CHA and MFI zeolites monitored by UV Raman spectroscopy

Journal

CHINESE JOURNAL OF CATALYSIS
Volume 40, Issue 12, Pages 1854-1859

Publisher

SCIENCE PRESS
DOI: 10.1016/S1872-2067(19)63287-0

Keywords

Interzeolite transformation; UV Raman spectroscopy; DFT calculation; Double 6-memberred rings; Decomposition and re-assembly

Funding

  1. National Key R&D Program of China [20171/F130702800]
  2. National Natural Science Foundation of China [2152780065, 91634201, 21720102001]
  3. Strategic Priority Research Program of Chinese Academy of Sciences [XDB17000000]

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As a powerful and sensitive tool for the characterization of zeolite building units, UV Raman spectroscopy has been used to monitor interzeolite transformation from FAU to CHA and MFI zeolites. The results show that the behavior of double 6-membered rings (D6Rs) in the FAU zeolite framework plays an important role during the formation of the target product in the interzeolite transformation. For the transformation of FAU to CHA, because both zeolites contain the same D6R units, direct transformation occurs, in which the D6Rs were largely unchanged. In contrast, for the transformation of FAU to MFI, the D6Rs can be divided into two single 6-membered rings (S6Rs), which further assembled into the MFI structure. In this crystallization, 5-membered rings (5Rs) are only observed in the MFI framework formation, suggesting that the basic building units in the transformation of FAU to MFI are S6Rs rather than 5Rs. These insights will be helpful for further understanding of the interzeolite transformation. (C) 2019, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

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